#include <stdio.h>
int main(void){
	float pi = 3.1415;
	float radius;
	float circleSquare, circleCircumference;
	
	printf("Please input the radius of circle:\n");
	scanf("%f",&radius);
	
	circleSquare = pi * radius * radius;
	circleCircumference = 2 * pi * radius; 
	
	printf("The square of circle is %f\n", circleSquare);
	printf("The circumference of circle is %f\n", circleCircumference);
	
	return 0;
}
